How to perform salt spray test?
Introduction:
A Salt Spray Test Chamber (also called Salt Spray Test Machine or Salt Fog Test Chamber) is a laboratory equipment used to evaluate the corrosion resistance of materials and surface coatings.
A standard salt spray test machine usually includes:
Test chamber cabinet, Salt solution tank, Spray nozzle / atomizer, Air saturation tower, Temperature control system, Sample rack, Control panel / PLC controller.
Features:
1) Multi-functions: support NSS (Neutral Salt Spray), ACSS (Acetic Acid Salt Spray) and CASS (Copper Accelerated Acetic Acid Salt Spray).
2) Widely applications: the salt spray testing is commonly used for Fasteners and bolts, Automotive parts, Bearings, Heat-treated metal components, Electroplated parts, Painted or coated metals, Aluminum alloy products, Electronic connectors and components, etc. The salt spray chamber helps manufacturers verify the quality and corrosion resistance of protective coatings and metal materials.
3) High quality level: The equipment supports international corrosion testing standards, including: ASTM B117 Salt Spray Test, ISO 9227 Salt Spray Test, GB/T 10125 Salt Spray Test, JIS Z2371 Salt Spray Test
4) Safety operation design: System will automatic start running protective when Voltage overload or temperature overload or chamber less water.
5) Easy maintenance and repair: Each function is controlled by an independent switch, and the corresponding indicator light will indicate when a fault occurs, making it easy to troubleshoot the problem at any time.
Specification:
Model | eSalt-270 |
Test Chamber size | 900 *600 *500mm (W*D*H), 270L |
Machine outer size | 1400*780*1090mm (W*D*H) |
Test Chamber temperature | Salt water test (NSS, ACSS) 35℃±1℃; Corrosion resistance test (CASS) 50±1ºC |
Air cylinder temperature | NSS, ACSS: 47℃±1℃; CASS: 63℃±1℃ |
PH | Salt water test (NSS, ACSS): 6.5-7.2; Corrosion resistance test (CASS): 3.0-3.2 |
Nozzle | Made of special glass, the spray volume and spray angle are adjustable. |
Spray quantity | 1.0-2.0 ml / 80cm² / h (at least 16 hours of collection, average) |
Spray type | Continuous or intermittent |
Spray principle | Bernoulli principle, the atomized saline solution is drawn in and then atomized, resulting in uniform atomization without any clogging or crystallization, ensuring consistent testing standards. |
Test chamber material | High quality Taiwan made PVC, thickness 5mm, Durable temperature up to 85℃ |
Chamber cover | Imported acrylic, 5mm thick |
Fluid cup | 5000ml cup with volume scale, easy clean |
Sample Rack | The rack inside the test chamber uses an indexing rack, which can be adjusted at any angle. Fogging are completely consistent on all four sides, allowing for the placement of a large number of test pieces. |
Compressed air pressure | 1.00±0.01kgf / cm² |
Pressure tank | Stainless steel 304 material; it is not easy to rust, and the high pressure makes the spray more uniform; and making the pressure tank have the best heat preservation effect. |
Air supply system | Air pressure is 1 kg/cm², adjustable by two controller. Backside controller recommend set pressure at 2kg/cm² (0.2MPa); front controller recommend set pressure at 1kg/cm² (0.1MPa) |
Heating system | It adopts a direct heating method, which heats up quickly and reduces standby time. When the temperature is reached, it switches between ON and OFF, ensuring precise temperature control and low power consumption. |
Safety protection system | The power supply will automatically shut off when the water level is low. The heater power supply will automatically shut off when the temperature exceeds the limit. With safety warning light |
Power | Single phase, 220V 50Hz, 2000W |
Control System：
Item name | Quantity | Remarks |
Test chamber temperature controller | 1pc | BLM |
Pressure Tank Temperature Controller | 1pc | BLM |
Digital display controller | 2pcs | JSS48A |
Pressure tank | 1 set | SUS304 |
Temperature sensor | 2psc | Taiwan Luchang (K-02) |
SSR | 2pcs | Longbo SD-40A and SD-25A |
Test chamber body (Double layer) | 1 set | Taiwan Nan Ya PVC Polyethylene Sheet |
Test chamber sealing lid (cover) | 1pc | Taiwan Nan Ya PVC Polyethylene Sheet |
Heating element | 2pcs | Titanium alloy and SUS304 |
Nozzle | 1pc | American Quartz |
Spray solenoid valve | 1pc | Jintong |
Demisting solenoid valve | 1pc | NBSZC |
Intermediate relay | 3pcs | SHNBN |
Liquid level switch | 2pcs | Taiwan Yuanfeng |
Pressure regulating valve | 2pcs | German Jardek |
Indicator lights | 4pcs | Taiwan |
Standard Accessory:
Spray tower | 1 set |
Collector | 2 pcs |
Glass nozzles | 1 pc |
Standard measuring cylinder | 2 pcs |
Sodium chloride | 2 bottles |
V-shaped support sample rack | 4 pcs |
O-shaped support | 6 pcs |
Manual book | 1 pc |
Comparison of Salt Spray Test Methods:
Test Type | Environment | Temperature | Corrosion Severity | Main Applications |
NSS | Neutral | 35°C | Medium | Fasteners, metal coatings |
ACSS | Acidic | 35°C | High | Decorative plating |
CASS | Copper accelerated acidic | 50°C | Very High | Nickel-chromium coatings |
